File:H Hughes Drill Patent 1908 Filing.jpg
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Summary
| Description |
English: Patent filing by Howard Hughes (1908) for a two-cone drill bit, used for oil well drilling |
| Date | |
| Source | US Patent Drawing |
| Author | Howard Hughes |
Licensing
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This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
 Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings. |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 15:10, 21 October 2019 | | 511 × 843 (151 KB) | TomahF | User created page with UploadWizard |
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